allen



(No Model.) 2 Sheets-Sll1eet 1.

J P. ALLEN.

AIR COMPRESSOR. I No. 299,314. Patented May 27, 1884.-

MM/M/Q H ig? 2 Sheets-Sheet 2.

(No Model.)

J. P. ALLEN.

AIR COMPRESSOR.

Patented May 2'7, 1884.

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UNITED @TATFS Parent @rricn,

JOHN F. ALLEN, OF BROOKLYN, NEW YORK.

AIR- COMPRESSOR.

SPECIFICATION forming part of-Letters Patent No. 299,314, dated May 27, 1884:. Application filed April 16, 1883. (No model.)

To all whom it may concern:

Be it known that I, JOHN F. ALLEN, of Brooklyn, in the State of New York, have 111- vented a new and useful Improvement in Air- Oompressors, of which the following is a specification.

The nature of my invention consists, first, in the arrangement of the air-compressing cylinder, and the steam-cylinder operating the same, with the intermediate frame by attaching the same to the end of said framing and allowing said cylinders to overhang the frame 5 second, in the manner of connecting the pistons of the air-compressing cylinder and of the steamcylinder with each other by means of rods passing above and below the crankshaft, in connection with suitable guidingblocks, to one of which the connecting-rod is attached.

In the accompanying drawings, Figure I represents a longitudinal section of an air-compressor embodying my invention. Fig. II is a vertical cross-section near the center of shaft. Fig. III shows a horizontal view of the pistons, reciprocating blocks, and crank shaft, and their connections, partly in section.

Similar letters represent similar parts.

A is the framing, with suitable bearings for the crank-shaft S, and provided at each end with cylinders B and O, acting as guides for the cylindrical blocks F and M.

To the end flanges, c and b, the steam-cylinder E and the air-compressing cylinder D are attached through their respective end flanges, e and (l. Thesteam-cylinder piston G is attached through its piston-rod N with the block M, and the piston II of the air-compressing cylinder D is attached through its piston-rod J with the block F. The cylindrical block F acts at the same time as the cross-head, and carries the pin L, to which the connecting-rod T (represented only by a dotted linein the drawings) is attached, the other end being connected with the crank-pin S. The blocks F and M are connected together by two or four rods, R R, passing above and below the crank-shaft S, between the sides of the cranks and the bearings of the shaft. On the ends of the crank-shaft S suitable fly-wheels are attached, to assist in regulating the motion of the machine. By this arrangement I obtain a direct connection between the steam-cylinder piston G and the air-compressing-cylinder piston H, to communicate the power derived from the force of the steam acting against the piston G direct to the air-piston II for compressing the air, the connecting-rod T acting only to regulate the motion of said piston.

By the arrangement of attaching the cylinders to the end of the frame and allowing said cylinders to overhang, the construction is much simplified, and the cylinders are allowed a free expansion endwise without any detrimental effect to eachother or to the whole machine.

In large machines the block M may be dispensed with and the rods R B pass direct through'suitable stuffing-boxes into the steamcylinder, and are there connected direct to the piston G; but I prefer the employment of the block M, as thereby the weight of the same added to the weight of the block F is easily increased, and the advantages derived from these heavyreciprocating parts, as fully explained in my Letters Patent No. 237,860, of February 8, 1881, are more easily obtained.

Instead of making the blocks F and M cylindrical, as above mentioned, the same may be made of any other shape, and guided accordingly; but I prefer to make the same cy lindrical, as thereby the frame A is made more simplein construction and the whole 1na-- chine more solid.

I am aware thatsteamengines have been constructed with the steam-cylinder attached to the end of the bed-plate and overhanging the same, and do not claim this arrangement, therefore, broadly.

I am likewise aware that steam-engines have been constructed with two or four piston-rods passing on the sides of the main shaft to a cross-head situated on the other side of the shaft, and with the connecting-rod attached to said eross-head and back again to the crankshaft, and consequently do not claim this arrangement, broadly; but

\Vhat I claim as my invention, and desire to secure by Letters Patent, is

1. In an air-compressor having the steamcylinder and the aircompressing cylinder placed in one line, the steam-cylinder E and the air-compressing cylinder D, attached to above and below the crank-shaft S, the block IO the ends of the main frame A, and ove'rhang- F, piston-rod J, and air-compressing piston ing the same, substantially as described. H, with connecting-rod 'I and crank-shaft S, 2. In an air-compressing machine having substantially in the manner and for the pur- 5 the steam-cylinder and the air-compressing pose herein set forth.

cylinder placed in the same line, with the JOHN F. ALLEN. crank-shaft between said cylinders, the cbm- XVitnesses: bination of the steam-cylinder piston G, its HENRY E. ROEDER,

pist0nr0d N, the block M, rods R R, passing J. GEMMEL, Jr. 

